There is a 1-week screening period(-1 week) during which participants will be monitored while they use an albuterol inhaler as needed. Study visits will occur at weeks 0(Baseline), weeks 3, weeks 6. Participants will undergo a physical examination, lung function, blood and urine collection. At the Weeks 0 study visit, participants will be randomly assigned to one of the following two groups for 6 weeks of treatment: